Thanks for your advice! I've seen that warning with our other apps, but not this time. "Resubmit for Review" was disabled until we uploaded a new binary. It now says "Waiting for Review"; before, it seemed Apple needed something from us. We've submitted all the documentation we can think of. We had to launch on Android first, likely losing sales as a result. Since this is our first rejection, we're worried something is still missing, but Apple hasn't replied to clarify. Thanks again!